wasm: support vendor:stb/truetype and vendor:fontstash

vendor/stb/src/Makefile

@@ -6,6 +6,10 @@ else
 all: unix
 endif
 
+wasm:
+	mkdir -p ../lib
+	clang -c -Os --target=wasm32 -nostdlib stb_truetype_wasm.c -o ../lib/stb_truetype_wasm.o
+
 unix:
 	mkdir -p ../lib
 	$(CC) -c -O2 -Os -fPIC stb_image.c stb_image_write.c stb_image_resize.c stb_truetype.c stb_rect_pack.c stb_vorbis.c

vendor/stb/src/stb_truetype_wasm.c

@@ -0,0 +1,46 @@
+#include <stddef.h>
+
+void *stbtt_malloc(size_t size);
+void stbtt_free(void *ptr);
+
+void stbtt_qsort(void* base, size_t num, size_t size, int (*compare)(const void*, const void*));
+
+double stbtt_floor(double x);
+double stbtt_ceil(double x);
+double stbtt_sqrt(double x);
+double stbtt_pow(double x, double y);
+double stbtt_fmod(double x, double y);
+double stbtt_cos(double x);
+double stbtt_acos(double x);
+double stbtt_fabs(double x);
+
+unsigned long stbtt_strlen(const char *str);
+
+void *memcpy(void *dst, const void *src, size_t count);
+void *memset(void *dst, int x, size_t count);
+
+#define STBRP_SORT stbtt_qsort
+#define STBRP_ASSERT(condition) ((void)0)
+
+#define STBTT_malloc(x,u)  ((void)(u),stbtt_malloc(x))
+#define STBTT_free(x,u)    ((void)(u),stbtt_free(x))
+
+#define STBTT_assert(condition) ((void)0)
+
+#define STBTT_ifloor(x)   ((int) stbtt_floor(x))
+#define STBTT_iceil(x)    ((int) stbtt_ceil(x))
+#define STBTT_sqrt(x)      stbtt_sqrt(x)
+#define STBTT_pow(x,y)     stbtt_pow(x,y)
+#define STBTT_fmod(x,y)    stbtt_fmod(x,y)
+#define STBTT_cos(x)       stbtt_cos(x)
+#define STBTT_acos(x)      stbtt_acos(x)
+#define STBTT_fabs(x)      stbtt_fabs(x)
+#define STBTT_strlen(x)    stbtt_strlen(x)
+#define STBTT_memcpy       memcpy
+#define STBTT_memset       memset
+
+#define STB_RECT_PACK_IMPLEMENTATION
+#include "stb_rect_pack.h"
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include "stb_truetype.h"